The process flow of two common electrostatic powder coating lines

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The process of electrostatic powder coating production line is mainly divided into 3 parts

• 1, pretreatment of the workpiece. The surface of the workpiece to be sprayed is cleaned and treated. Usually use phosphating process or sandblasting process.
• 2, powder coating, using electrostatic spraying method, the powder will be uniform and effective coverage on the surface of the workpiece.
• 3, drying and curing, the use of moderate high temperature, so that the surface of the workpiece powder curing, the formation of dense coating.

Powder coating process for hardware parts (surface phosphating pretreatment)

About phosphate treatment, what is phosphate treatment

Phosphating treatment is a chemical reaction to form a film (phosphate film) on the surface of a surface treatment process.
Phosphate treatment process is mainly used on metal surfaces, the purpose is also to provide a protective film on the surface of the metal, allowing the metal to be isolated from the air and prevent it from corrosion.
Will also be used for some products painted before the priming, with this layer of phosphate film can improve the adhesion of the paint layer and anti-corrosion ability, improve the decorative metal surface looks more beautiful, and can also play a role in part of the metal cold working process of lubrication.
After phosphate treatment can make the workpiece in a very long time will not oxidation rust, so the phosphate treatment is very widely used, is also commonly used a metal surface treatment process in the automotive, marine, machinery manufacturing and other industries are increasingly used.

Process flow

Upper part → hot water cleaning → pre-degreasing (60℃) → main degreasing (60℃),
→ water washing (1) → water washing (2) → acid washing → water washing (3) → water washing (4)
→Tuning table → Phosphating (40 - 45 ℃. (Chrome plating process for aluminum)
→Water washing (5) →Water washing (6) →Pure water washing (1)
→ dehydration drying (120 ℃) → electrostatic powder spraying system (including powder room, automatic spraying lift reciprocating machine, electrostatic generator, electrostatic spray gun, powder barrel, small cyclone powder recovery device) → drying and curing (160 ℃ - 420 ℃) → cooling → drop parts

Workpiece after each process, it is necessary to wash its water, which is mainly to clean off the workpiece surface residual chemical composition, to be able to successfully complete the next process. After phosphate treatment of the workpiece after spraying has a more uniform and dense coating layer, which can effectively enhance the service life of the workpiece and the surface corrosion level.

Powder coating process for hardware parts (sandblasting pretreatment)

Sandblasting is the use of compressed air as the power to form a high-speed jet beam, the abrasive high-speed jet to the surface of the workpiece to be treated, so that the physical changes in the external surface of the workpiece to meet the quality requirements.

【1】. The characteristics of sandblasting.

• 1, Sandblasting is the most thorough, versatile, rapid and efficient cleaning method.
• 2, Sandblasting treatment can be in different roughness between any choice, while other processes are no way to achieve this, manual sanding can hit the hairy surface but the speed is too slow, chemical solvent cleaning is too smooth surface cleaning is not conducive to coating bonding.

【2】 . The role of sandblasting: metal workpiece, non-metal workpiece surface cleaning, surface strengthening, surface beautification. 

• 1, surface pre-treatment processing: electroplating, painting, PU, rubber and plastic coating, metal spray welding, titanium plating, etc. before treatment and increase the adhesion of the surface. 
• 2、Surface beautification processing: various metal products of decorative processing and electroplating products of matte and soft matte treatment and non-metallic products such as: acrylic, Polly, crystal glass and other surface atomization treatment. 
• 3、Surface cleaning processing: metal oxide layer or black skin after heat treatment, surface pores, metal or non-metal surface dirt and rust elimination, ceramic surface black and coloring point removal or color painting regeneration, rubber mold and gravity die-casting mold oxide, residue or release agent removal. 
• 4, surface burr removal process: plastic, Bakelite products, zinc and aluminum die-casting products such as burr removal and electronic or other parts of the surface trimming treatment. 
• 5, electronic parts processing: silicon chip diffusion surface impurity removal operations, silicon chip sandblasting cut into small round grain etching processing operations, electronic parts packaging industry overflow glue burr spray removal, electronic parts finished surface printing removal, ceramic electric heating material cleaning.

Process Flow

Upper part → sandblasting (or shot blasting)
→ dust removal → electrostatic powder spraying (including powder spraying room, automatic powder spraying lift reciprocating machine, electrostatic generator, electrostatic spray gun, powder drum, small cyclone / secondary powder recovery device)
→ drying and curing (160 ℃ - 420 ℃) → cooling → lower

• 1) Sandblasting is the most thorough, versatile, rapid and efficient cleaning method.
• 2) Sandblasting treatment can be selected arbitrarily between different roughness, while other processes are not able to achieve this

After sandblasting pretreatment of the workpiece, after spraying powder can form a smoother, more dense external surface. This sandblasting pretreatment process is very efficient and versatile.

Conclusion

Hardware powder spraying line, spraying line, powder electrostatic spraying line is to charge plastic powder through high voltage electrostatic equipment and adsorb it evenly on the surface of the processed workpiece under the action of electric field, and then after high temperature baking, the plastic particles are melted into a dense protective layer firmly attached to the surface of the workpiece. 

Because of the small environmental pollution, recyclable powder and strong adhesion to metal, it has been widely used in the industries of automobile, machinery and equipment, aluminum alloy, doors and windows, guardrail plates, control cabinets and air conditioning shells. If you are interested in our powder coating production line, welcome your inquiry and request for quotation, we provide free 3D drawing design and guidance.

Michael Zhang

Sales Manager
Metal Surface Treatment Technology
M +86 150 8119 5156  (wechat/whatsapp)
E  sales06@coating-equipment.com
W www.coating-equipment.com

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